Product Description:

• One BT50 chuck holder, 23 pieces prime quality ER 40 collets, and one wrench are included in the package.
• Collets are made in inch not from metric conversion with the size listed below: 1/8, 5/32, 3/16, 7/32, 1/4, 9/32, 5/16, 11/32, 3/8, 7/16, 15/32, 1/2, 9/16, 19/32, 5/8, 11/16, 23/32, 3/4, 13/16, 27/32, 7/8, 29/32, 1”.
• Made of alloy steel and hardened to HRC 60-62.
• Balanced to 12,000 RPM
• Tested T.I.R: 0.0002"